کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5438890 | 1398189 | 2017 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of Ge and GeO2 on the microstructure and varistor properties of TiO2-Ta2O5-CaCO3 ceramics
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This study investigated the effect of elemental crystal Ge or/and GeO2 doping on the microstructure and varistor properties of TiO2-Ta2O5-CaCO3 varistor ceramics, which were prepared via the traditional ball milling-molding-sintering process. X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy-energy dispersive X-ray spectroscopy, scanning electron microscopy-energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy demonstrated that co-doping with Ge and GeO2 changed the microstructure of TiO2-Ta2O5-CaCO3 ceramics, thereby increasing the nonlinear coefficient and decreasing the breakdown voltage. The optimum doping concentrations of Ta2O5, CaCO3, Ge, and GeO2 exhibited the highest nonlinear coefficient (α=14.6), a lower breakdown voltage (EB=18.7 V mmâ1), the least leakage current (JL=10.5 μA cmâ2), and the highest grain boundary barrier (ΦB=1.05 eV). In addition, Ge and GeO2 function as sintering aids, which reduce the sintering temperature because of their low melting points.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 4, March 2017, Pages 3465-3474
Journal: Ceramics International - Volume 43, Issue 4, March 2017, Pages 3465-3474
نویسندگان
Kunyong Kang, Zhifeng Zheng, Sida Xie, Jun Zhang, Kaimeng Xu, Lei Tao, Xuequan Rong, Zhefeng Xu, Jikang Yan, Guoyou Gan,